Danfoss 180F7021 User guide

Brand: Danfoss

Model: 180F7021

Type: User guide

Introduction

It is always the customer’s responsibility to de-

sign the manifolds according to the design rules

of the ﬂexible couplings used.

Typical, manifold for multiple iSaves® are made

in hard piping, using ﬂexible coupling as con-

nection to the iSave discharge and inlet.

This paper shows some design rules based on

Victaulic® Flexible couplings style 77 in duplex.

Other supplier of ﬂexible couplings may have

diﬀerent design rules.

(Victaulic® is a registered name of Victaulic)

Design Guide

Piping connections

Experience in the market shows that precise

welding of a steel manifold with multiple

connections is diﬃcult. The individual position

of the manifold connections may exceed the

ﬂexibility of a single ﬂexible coupling.

For both iSave ERDs and APP pumps:

• To reduce stress on the discharge and

inlet it is preferred to use ﬂexible hoses

or a minimum of 2 ﬂexible couplings

combined on the same pipe.

• When using hard piping, it is important

to allow a gap between each individual

Victaulic connection. See “Spacing” in

table below.

• The use of only one ﬂexible coupling to dis-

charge or inlet should be accurately controlled

to ensure the proper alignment of the manifold.

• Do not force any misaligned pipes to connect

to discharge or inlet.

• Do not use the discharge or inlet connection as

support for pipes. The pipes must have sepa-

rate support close to the end of the pipe.

Victaulic®

Flexible coupling

Style 77DX

Cut grooved

Pipe SC40

1½” 3.2 0 mm 3° - 52´ or 66 15120

2” 3.2 0 mm 3° or 52 23575

2½” 3.2 0 mm 2° - 30´ or 44 34250

3” 3.2 0 mm 2° or 36 51150

4” 6.4 0 mm 3° - 12´ or 56 84500

6” 6.4 0 mm 2° - 24´ or 36 184000

Spacing

[mm]

Max. angle

[Deg.] or [mm]

Max. radial oﬀset

[mm]

End load

[N]

Pipe support Flexible coupling Styles 77 and others standard

grooved-type couplings allow angular, linear and

rotational movement at each joint, to accommo-

date expansion, contraction, settling,

vibration, noise and other piping movement.

This must be considered when determinate

hanger and support bracing. See Reference

Victaulic – Design Data 26.01.

At least 2 ﬂexible couplings must be used to compensate radial misalignment. Angular deﬂection of each

joint must not exceed Maximum angle from centerline. Se example reference “Victaulic – Design Data 26.01

page 3.

The grooved piping method will not allow both maximum linear movement and maximum angular move

ment simultaneously at the same joint.

End Loads are total, from all internal and external loads, based on duplex stainless steel pipe.

Reference should always be made to the I-100

Victaulic® Field Installation Handbook for the

product you are installing

www.victaulic.com

All References are based Victaulic “Duplex – grooved

couplings 17.20”. If groves are standard roll groove

numbers above may be halved.

Notes

Design Guide Victaulic® Couplings

180R9367 | 521B1390 | DKCFN.PI.000.3A.02 | 12.2016

Danfoss can accept no responsibility for possible errors in catalogues, brochures and other printed material. Danfoss reserves the right to alter its products without notice.

This also applies to products already on order provided that such alterations can be made without subsequential changes being necessary in speciﬁcations already agreed.